diff --git a/ports/rp2/machine_uart.c b/ports/rp2/machine_uart.c
index 689906003e7dc..955e4a8479913 100644
--- a/ports/rp2/machine_uart.c
+++ b/ports/rp2/machine_uart.c
@@ -458,6 +458,7 @@ static mp_obj_t mp_machine_uart_make_new(const mp_obj_type_t *type, size_t n_arg
}
static void mp_machine_uart_deinit(machine_uart_obj_t *self) {
+ uart_tx_wait_blocking(self->uart); // Flush TX FIFO if necessary
uart_deinit(self->uart);
if (self->uart_id == 0) {
irq_set_enabled(UART0_IRQ, false);
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